Chair seat



1.1 is a front perspective view of a chair seat, showing our new design;

1.2 is a side view thereof;

1.3 is a side view thereof, from a side opposite that of 1.2;

1.4 is a front view thereof; and

1.5 is a top view thereof.

The broken lines are shown for the purpose of illustrating the environment of the chair seat and form no part of the claimed design. 

CLAIM The ornamental design for a chair seat, as shown and described. 